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Minecraft Nether Portal Calculator - Coordinate Converter

Free online calculator to convert Overworld coordinates to Nether coordinates. Plan nether portals, calculate obsidian requirements, and travel distances.

Quick answer:Divide Overworld X and Z by 8 for the Nether (multiply by 8 to go back); Y stays the same. Build each portal's partner at exactly those coordinates and they will link both ways. Add your portals to the link checker to see where each one really goes.

Coordinate Converter

I am in the

Build the Nether portal at

X 100 · Y 70 · Z -40

1 block in the Nether = 8 blocks in the Overworld · The Y coordinate is not scaled between dimensions, but affects portal linking distance.

Portal link checker

Enter your portals in both dimensions. The checker applies the game's own linking rules and shows where each portal leads, whether it links back, and where to build a missing partner.

Base
Base

Use the purple portal block at the lowest corner (smallest X or Z, bottom row).

  • Base → Nether

    Links to Base, and it links back. Good pair.

  • Base → Overworld

    Links to Base, and it links back. Good pair.

Portal Materials

Obsidian needed
14
Interior size
2 × 3

Minimum portal: 4×5 (10 obsidian without corners) · Maximum portal: 23×23

Distance Calculator

Two Overworld points: how long the trip takes through the Nether.

Overworld distance
4,717 blocks
Nether distance
590 blocks
  • Walking137 s in the Nether / 1093 s walking the Overworld
  • Sprinting105 s in the Nether / 841 s walking the Overworld
  • Boat on blue ice8 s in the Nether / 65 s walking the Overworld

Portal Linking Rules

When you step through a portal, the game scales your position (divide X and Z by 8 into the Nether, multiply by 8 back) and looks for an existing portal within a square of 16 blocks in the Nether or 128 blocks in the Overworld, at any height. It picks the portal block closest in 3D, including height. If there is none, it builds a new portal nearby.

  • Build your Nether-side portal at the exact calculated coordinates for reliable two-way linking.
  • Overworld portals closer than about 128 blocks to each other can end up sharing one Nether portal unless each has its own partner at the exact coordinates.
  • The Y coordinate matters for linking distance — try to match Y levels when possible.
  • Use F3 in-game to view your exact coordinates before entering them here.

Frequently Asked Questions

Divide your Overworld X and Z coordinates by 8 to get the corresponding Nether coordinates. The Y coordinate stays the same. For example, Overworld (800, 64, 400) becomes Nether (100, 64, 50). To convert from Nether to Overworld, multiply X and Z by 8.
The Y coordinate is not scaled in the conversion, but it IS used when the game calculates which portal to link to. The game uses 3D Euclidean distance including Y, so portals at very different heights can cause linking to the wrong portal.
The minimum nether portal (4 wide × 5 tall) requires 10 obsidian blocks without corners or 14 with corners. The maximum portal size of 23×23 requires up to 88 obsidian blocks with corners.
Another portal was closer to the scaled coordinates than the one you wanted. The game searches 16 blocks around the target in the Nether and 128 blocks in the Overworld and takes the closest portal block in 3D. Build the partner at the exact coordinates this calculator gives, and use the link checker to confirm both directions.
The 1:8 ratio is the same on Bedrock, so the converted coordinates work there too. Bedrock uses its own search ranges, so the link checker's results are for Java Edition.
There is no fixed minimum if every portal has its partner at the exact coordinates, because the game always picks the closest one. Problems start when a portal has no partner: in the Nether any portal within 16 blocks of the target can grab the link, in the Overworld any portal within 128 blocks.
A nether hub is a central structure in the Nether connecting multiple portals for fast travel. Since 1 Nether block = 8 Overworld blocks, travelling through a nether hub reduces travel distance by 87.5%, making it the most efficient way to move between distant bases.
A boat on blue ice, at about 72 blocks per second. In the Nether that covers the same ground as about 580 blocks per second in the Overworld, which is why ice roads in the Nether are so popular.

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